env: [
                            {
                                name: "DD_KUBERNETES_KUBELET_HOST",
                                valueFrom: {
                                    fieldRef: {
                                        fieldPath: "status.hostIP",
                                    },
                                },
                            },

Is it possible to use "valueFrom" and how in Pulumi in C#?

Did you get any particular issue while trying https://github.com/pulumi/pulumi-kubernetes/blob/72b173c04166be5fa8acb0f8876e41caab3e13a3/sdk/dotnet/Core/V1/Inputs/EnvVarArgs.cs#L34 ?

I did find that but finally I went for another solution. Thanks for your response, though.